System.out.println(username+password);
String sql = "select * from user where name =? and password  =?";			
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1,"中文乱码");
preparedStatement.setString(2,password);
System.out.println(preparedStatement.toString());

这样在后台输出sql语句是：com.mysql.jdbc.JDBC4PreparedStatement@5009ea: select * from user where name ='??' and password ='123' 中文是？？。 解决方法：原因是设置datasource 的driver 时jdbc.url=jdbc:mysql://localhost:3306/shoppiong 没有指定编码 改成：

private final static String URL = "jdbc:mysql://localhost/shoppingstyle=?characterEncoding=utf8";

这样在重新运行程序，后台输出sql语句为：com.mysql.jdbc.JDBC4PreparedStatement@c07125: select * from user where name ='张山' and password ='123'
解决了乱码问题

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